US6560129B1 - Power supply unit and process for generating protective currents to protect metal lines against corrosion - Google Patents

Power supply unit and process for generating protective currents to protect metal lines against corrosion Download PDF

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Publication number
US6560129B1
US6560129B1 US09/959,070 US95907001A US6560129B1 US 6560129 B1 US6560129 B1 US 6560129B1 US 95907001 A US95907001 A US 95907001A US 6560129 B1 US6560129 B1 US 6560129B1
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United States
Prior art keywords
voltage
supply unit
power supply
fact
power source
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Expired - Fee Related
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US09/959,070
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English (en)
Inventor
Martin Walger
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Nokia Oyj
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Nokia Oyj
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Assigned to NOKIA CORPORATION reassignment NOKIA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WALGER, MARTIN
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Publication of US6560129B1 publication Critical patent/US6560129B1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13166—Fault prevention
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1319—Amplifier, attenuation circuit, echo suppressor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13305—Transistors, semiconductors in general

Definitions

  • the invention relates to a power supply unit for generating a protective current (sealing current), which is superposed on signal currents carried by metal lines for protection against corrosion.
  • the invention also relates to a process for generating such a protective current (sealing current), which is superposed on signal currents carried by metal lines for protection against corrosion.
  • metal terminating unit metallic termination
  • the operating states of the metal terminating unit are the non-conducting state OFF (high impedance) and conductive state ON (low impedance).
  • a process for generating a protective current (sealing current) for protection against corrosion of splices and/or tie points of metal lines via a power supply unit which comprises a first and second voltage-controlled power source, wherein the first power source is capable, depending on an applied binary control voltage, to generate a constant current having a first value of 0 mA, or a constant current having a second value of at least 1 mA, in particular 1.2 mA, and wherein the second power source is capable, at below a threshold value, in particular of 0 V, to generate a constant current having a third value of 0 mA, and at above the threshold value of the applied voltage and proportional to the latter, a current between the constant current having the third value and a fourth value 20 mA diminished at least by the constant current having the second value of the first power source, characterized by the following steps:
  • Corresponding control software is advantageously used to control the voltages to be applied to the inputs of the power supply unit, e.g., integrated in the microprocessor of the user terminal card.
  • Software control is particularly easy to implement. However, it can also take place in any other manner desired, e.g., via hard-wired logic.
  • the connecting cables are connected with two line-side coils of a transformer, between which one coupling capacitor C 1 , C 2 each is arranged.
  • a metal terminating unit MT which is connected via the capacitor C 1 between the transformer coils of the network terminating unit NT.
  • a power supply unit SCC Located in line terminating unit LT is a power supply unit SCC according to the invention, whose outputs are connected via the capacitor C 2 between the transformer coils of the line terminating unit LT.
  • the output of the second level converter LC 2 is connected with the control input of a second voltage-controlled power source J 2 via an RC integrator RCI and a level shifter LS.
  • the second power source J 2 delivers a current I 2 that is directly proportional to the voltage applied to its control input if the latter exceeds a threshold value that is here set to 0V. In this case, scaling takes place with 18.8 mA/(maximal applied voltage UC 2,max ), so that a maximal current I 2 of 18.8 mA is output by the second power source J 2 .
  • the structural components of the RC generator RCI and the offset voltage of the level shifter LS are selected in such a way that a maximal current rise of 20 mA/s arises in the current I 2 generated by the second power source J 2 . Since the current I 1 generated by the first power source J 1 is constant, the rise in total current after the jump to 1.2 mA is hence limited to a maximal 20 mA/s.
  • a permanent protective current of 1.2 mA generated by the first power source J 1 is in turn applied to the line.
  • a short-term increase in the output current takes place per the progression shown on FIG. 3 at certain intervals in which the second power source J 2 is additionally activated, resulting form a superposition of the currents output by the first and second power source J 1 , J 2 , wherein the total current rises up to 20 mA.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Devices For Supply Of Signal Current (AREA)
US09/959,070 1999-04-24 2000-03-29 Power supply unit and process for generating protective currents to protect metal lines against corrosion Expired - Fee Related US6560129B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19918753A DE19918753C2 (de) 1999-04-24 1999-04-24 Stromversorgungseinheit und Verfahren zum Generieren von Schutzströmen zum Schutz von metallischen Leitungen vor Korrosion
DE19918753 1999-04-24
PCT/EP2000/002734 WO2000065821A1 (en) 1999-04-24 2000-03-29 Power supply unit and process for generating protective currents to protect metal lines against corrosion

Publications (1)

Publication Number Publication Date
US6560129B1 true US6560129B1 (en) 2003-05-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US09/959,070 Expired - Fee Related US6560129B1 (en) 1999-04-24 2000-03-29 Power supply unit and process for generating protective currents to protect metal lines against corrosion

Country Status (5)

Country Link
US (1) US6560129B1 (de)
EP (1) EP1173971A1 (de)
AU (1) AU4112700A (de)
DE (1) DE19918753C2 (de)
WO (1) WO2000065821A1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004032206A1 (de) * 2004-07-02 2006-01-26 Siemens Ag Anordnung zur Einspeisung von Frittstrom in zumindest ein Leitungspaar
DE102004032205A1 (de) * 2004-07-02 2006-01-26 Siemens Ag Anordnung zur Einspeisung von Frittstrom in zumindest ein Leitungspaar
EP1713247A2 (de) 2005-04-13 2006-10-18 Alcatel Fernmigration von einem ersten Dienst nach einem zweiten Dienst
US20070116260A1 (en) * 2005-11-16 2007-05-24 Sodersjerna Roy N Termination circuit for broadband signal lines
US20070230686A1 (en) * 2006-04-03 2007-10-04 Huawei Technologies Co., Ltd. Method and Devices for Providing Wetting Current
US20070286172A1 (en) * 2006-05-23 2007-12-13 Duran Christian S xDSL VoIP adapter device
US7773744B1 (en) * 2004-11-04 2010-08-10 Adtran, Inc. System and method for terminating sealing current
US7787614B2 (en) 2005-10-11 2010-08-31 Corning Cable Systems Llc Sealing current terminator for inhibiting oxidation and methods therefor
US20130106319A1 (en) * 2010-07-02 2013-05-02 Sinfonia Technology Co., Ltd. Linear actuator driving device
US20160198038A1 (en) * 2014-12-08 2016-07-07 ENGINUITY Communications Corp. Cable Pair Stabilizer Unit and Method and System for Generating Sealing Current

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6495116B1 (en) 2000-04-10 2002-12-17 Lockheed Martin Corporation Net shape manufacturing using carbon nanotubes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131033A (en) 1990-05-15 1992-07-14 Xel Communications, Inc. Sealing current generator for a telephone circuit
US5216704A (en) 1991-06-12 1993-06-01 Coherent Communications Systems Corp. Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops
US5442697A (en) * 1993-11-29 1995-08-15 Adtran Corporation Digital data loopback device
US5642412A (en) * 1994-12-22 1997-06-24 General Datacomm, Inc. Isolated high impedance, DC current sources for telecommunications applications
US6351533B1 (en) * 1998-01-26 2002-02-26 Xircom, Inc. System and method for protecting devices connected to a telephone line

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131033A (en) 1990-05-15 1992-07-14 Xel Communications, Inc. Sealing current generator for a telephone circuit
US5216704A (en) 1991-06-12 1993-06-01 Coherent Communications Systems Corp. Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops
US5442697A (en) * 1993-11-29 1995-08-15 Adtran Corporation Digital data loopback device
US5642412A (en) * 1994-12-22 1997-06-24 General Datacomm, Inc. Isolated high impedance, DC current sources for telecommunications applications
US6351533B1 (en) * 1998-01-26 2002-02-26 Xircom, Inc. System and method for protecting devices connected to a telephone line

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Frantz et al. "Sealing Current And Its Impact On ISDN Powering Requirements", Proceedings of the Int'l Telecommunications Energy Conference, U.S., New York, IEEE, vol. Conf. 10, Oct. 30, 1988, pp. 151-156 (XP000042298).

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004032205A1 (de) * 2004-07-02 2006-01-26 Siemens Ag Anordnung zur Einspeisung von Frittstrom in zumindest ein Leitungspaar
DE102004032206A1 (de) * 2004-07-02 2006-01-26 Siemens Ag Anordnung zur Einspeisung von Frittstrom in zumindest ein Leitungspaar
US7773744B1 (en) * 2004-11-04 2010-08-10 Adtran, Inc. System and method for terminating sealing current
EP1713247A2 (de) 2005-04-13 2006-10-18 Alcatel Fernmigration von einem ersten Dienst nach einem zweiten Dienst
EP1713247A3 (de) * 2005-04-13 2007-12-12 Alcatel Lucent Fernmigration von einem ersten Dienst nach einem zweiten Dienst
CN1897627B (zh) * 2005-04-13 2011-09-21 阿尔卡特公司 从第一服务到第二服务的远程迁移
US7787614B2 (en) 2005-10-11 2010-08-31 Corning Cable Systems Llc Sealing current terminator for inhibiting oxidation and methods therefor
US20070116260A1 (en) * 2005-11-16 2007-05-24 Sodersjerna Roy N Termination circuit for broadband signal lines
US20070230686A1 (en) * 2006-04-03 2007-10-04 Huawei Technologies Co., Ltd. Method and Devices for Providing Wetting Current
US8275094B2 (en) * 2006-04-03 2012-09-25 Huawei Technologies Co., Ltd. Method and devices for providing wetting current
US20070286172A1 (en) * 2006-05-23 2007-12-13 Duran Christian S xDSL VoIP adapter device
US20130106319A1 (en) * 2010-07-02 2013-05-02 Sinfonia Technology Co., Ltd. Linear actuator driving device
US8912737B2 (en) * 2010-07-02 2014-12-16 Sinfonia Technology Co., Ltd. Linear actuator driving device
US20160198038A1 (en) * 2014-12-08 2016-07-07 ENGINUITY Communications Corp. Cable Pair Stabilizer Unit and Method and System for Generating Sealing Current
US10298748B2 (en) * 2014-12-08 2019-05-21 ENGINUITY Communications Corp. Cable pair stabilizer unit and method and system for generating sealing current
US20190379784A1 (en) * 2014-12-08 2019-12-12 ENGINUITY Communications Corp. Cable Pair Stabilizer Unit and Method and System for Generating Sealing Current
US10979555B2 (en) * 2014-12-08 2021-04-13 ENGINUITY Communications Corp. Cable pair stabilizer unit and method and system for generating sealing current

Also Published As

Publication number Publication date
WO2000065821A1 (en) 2000-11-02
EP1173971A1 (de) 2002-01-23
AU4112700A (en) 2000-11-10
DE19918753C2 (de) 2002-02-28
DE19918753A1 (de) 2000-11-02

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Owner name: NOKIA CORPORATION, FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WALGER, MARTIN;REEL/FRAME:012434/0255

Effective date: 20011109

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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

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Effective date: 20110506